Import new custom seekbar preference

* Credits: @difr for his ProperSeekbarPreference
* https://github.com/difr/android_device_xiaomi_land/commit/a92b140a4b5456a5262343467c8eec5ac4dcee37

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
diff --git a/res/values/attrs.xml b/res/values/attrs.xml
index 7ef177a..c8d3895 100644
--- a/res/values/attrs.xml
+++ b/res/values/attrs.xml
@@ -18,8 +18,9 @@
     <!-- Base attributes available to CustomSeekBarPreference. -->
     <declare-styleable name="CustomSeekBarPreference">
         <attr name="interval" format="integer" />
-        <attr name="min" format="integer" />
+        <attr name="showSign" format="boolean" />
         <attr name="units" format="string|reference" />
+        <attr name="continuousUpdates" format="boolean" />
         <attr name="defaultText" format="string|reference" />
     </declare-styleable>